This project was completed to check
for viability of online monitored motion detection for security purposes.
Security for a multi-resident home is not easy and, not having a way to monitor
when a room is being accessed has caused problems for me. This project is the
first step to the creation of a new personal smart security system that will be
cheap and easy enough to be implanted by anyone, including a college student. The
motion detector publishes through IFTTT to a mobile device, allowing remote
monitoring of a location with a WIFI signal.
detector was constructed using a microcontroller, and a PIR sensor. A Particle
brand microcontroller was used for the project, this microcontroller has very
simple Internet connection ability. The passive infrared sensor or PIR sensor from adafruit passes full voltage when motion is sensed. With the Particle
powered with 5V and 1 amp, the system was able to pull power from the 3.3V port
on the Particle to power the PIR sensor. Shown below is the initial
wiring diagram of the system. With the power for the system setup, the output
of the PIR sensor was ran to a digital read port (D0) on the Particle. The code
for the system then loops to check if D0 shows a high voltage reading, and
publishes through IFTTT to a mobile device.
Hardware and Cost for Project
With these easy to find components purchased, The circuit can easily be setup according to the diagram below. To check the circuit, use the tinker app from particle to see if the D0 pin reads high voltage when a motion is created in front of the sensor.
Front of the Solder Board
If the above test works as it should then the code in the below section should be flashed to the Particle. After the code is running in the particle, the onboard LED should flash when a motion is made in front of the sensor. When the code is checked then IFTTT recipes can be made to send the notifications.
Notification when motion is detected